IMG_0017 - T wave(ventricular repolarization This is the...

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CardioYascular System L Cardiac Cycle : all events related to the flow of blood through the heart during one heartbeat Systole : when either ventricle or atria are contracting Diastole : when either ventricle or atria are relaxing ECG : a recording of the heart's electrical events LINK: P wave (atrial depolarization) This tracing results from the movement of the depolarization wave from the SA node through the atria. Lasts 0.08 sec. Atrial contraction follows. QRS complex (ventricular depolarization) This tracing results from ventricular depolarization down the intraventricular septum and up the ventricule walls. Lasts 0.08 sec. Atrial repolarization also occurs during this tirne. Ventricular contraction follows (from the apex of the heart to the top/base).
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Unformatted text preview: T wave (ventricular repolarization) This is the traeing caused by ventricular repolarization. Lasts 0.16 sec. Ventricular relaxation follows. Heart Yalves During the cycle, the valves open and close in response to differences in BP on their two sides. Pulmonary semilunar valve - at the entrance to the pulmonary trunk. Prevents backflow into the right ventricle. Right AY valve (tricuspid) - prevents backflow into right atrium when right ventricle contracts. Has three valve flaps. Aortic semilunar valve - at entrance to aorta. Prevents backflow into left ventricle. Left Av valve (bicuspidimitral) - prevents backflow into left atrium when left ventricle contracts. Has two valve flaps. YD...
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